Finding the Fourth Proportional to 99,662.80, 139,631.60 and 99,662.80

Step by Step Solution

1. Step 1: Write the proportion equation
   99,662.80 : 139,631.60 = 99,662.80 : x
2. Step 2: Convert to fraction form
   99,662.80/139,631.60 = 99,662.80/x
3. Step 3: Cross multiply
   99,662.80x = 139,631.60 × 99,662.80
4. Step 4: Simplify right side
   99,662.80x = 13,916,076,224.48
5. Step 5: Solve for x
   x = 13,916,076,224.48/99,662.80
6. Step 6: Final answer
   x = 139,631.60