Finding the Fourth Proportional to 99,692,967.20, 139,771,708 and 99,692,967.20

Step by Step Solution

1. Step 1: Write the proportion equation
   99,692,967.20 : 139,771,708 = 99,692,967.20 : x
2. Step 2: Convert to fraction form
   99,692,967.20/139,771,708 = 99,692,967.20/x
3. Step 3: Cross multiply
   99,692,967.20x = 139,771,708 × 99,692,967.20
4. Step 4: Simplify right side
   99,692,967.20x = 13,934,256,301,131,978
5. Step 5: Solve for x
   x = 13,934,256,301,131,978/99,692,967.20
6. Step 6: Final answer
   x = 139,771,708