Finding the Fourth Proportional to 139,968,139.05, 209,952,208.58 and 139,968,139.05

Step by Step Solution

1. Step 1: Write the proportion equation
   139,968,139.05 : 209,952,208.58 = 139,968,139.05 : x
2. Step 2: Convert to fraction form
   139,968,139.05/209,952,208.58 = 139,968,139.05/x
3. Step 3: Cross multiply
   139,968,139.05x = 209,952,208.58 × 139,968,139.05
4. Step 4: Simplify right side
   139,968,139.05x = 29,386,619,923,680,204
5. Step 5: Solve for x
   x = 29,386,619,923,680,204/139,968,139.05
6. Step 6: Final answer
   x = 209,952,208.58