Finding the Fourth Proportional to 139,968,287.60, 209,574,517.80 and 139,968,287.60

Step by Step Solution

1. Step 1: Write the proportion equation
   139,968,287.60 : 209,574,517.80 = 139,968,287.60 : x
2. Step 2: Convert to fraction form
   139,968,287.60/209,574,517.80 = 139,968,287.60/x
3. Step 3: Cross multiply
   139,968,287.60x = 209,574,517.80 × 139,968,287.60
4. Step 4: Simplify right side
   139,968,287.60x = 29,333,786,381,061,720
5. Step 5: Solve for x
   x = 29,333,786,381,061,720/139,968,287.60
6. Step 6: Final answer
   x = 209,574,517.80