Finding the Fourth Proportional to 139,906.16, 209,862.88 and 46,412.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,906.16 : 209,862.88 = 46,412.72 : x
2. Step 2: Convert to fraction form
   139,906.16/209,862.88 = 46,412.72/x
3. Step 3: Cross multiply
   139,906.16x = 209,862.88 × 46,412.72
4. Step 4: Simplify right side
   139,906.16x = 9,740,307,087.83
5. Step 5: Solve for x
   x = 9,740,307,087.83/139,906.16
6. Step 6: Final answer
   x = 69,620.29