Finding the Fourth Proportional to 91,908.10, 137,570.55 and 91,908.10

Step by Step Solution

1. Step 1: Write the proportion equation
   91,908.10 : 137,570.55 = 91,908.10 : x
2. Step 2: Convert to fraction form
   91,908.10/137,570.55 = 91,908.10/x
3. Step 3: Cross multiply
   91,908.10x = 137,570.55 × 91,908.10
4. Step 4: Simplify right side
   91,908.10x = 12,643,847,866.46
5. Step 5: Solve for x
   x = 12,643,847,866.46/91,908.10
6. Step 6: Final answer
   x = 137,570.55