Finding the Fourth Proportional to 86,940.10, 130,118.55 and 86,940.10

Step by Step Solution

1. Step 1: Write the proportion equation
   86,940.10 : 130,118.55 = 86,940.10 : x
2. Step 2: Convert to fraction form
   86,940.10/130,118.55 = 86,940.10/x
3. Step 3: Cross multiply
   86,940.10x = 130,118.55 × 86,940.10
4. Step 4: Simplify right side
   86,940.10x = 11,312,519,748.86
5. Step 5: Solve for x
   x = 11,312,519,748.86/86,940.10
6. Step 6: Final answer
   x = 130,118.55