Finding the Fourth Proportional to 93,180.78, 139,095.63 and 86,243.13

Step by Step Solution

1. Step 1: Write the proportion equation
   93,180.78 : 139,095.63 = 86,243.13 : x
2. Step 2: Convert to fraction form
   93,180.78/139,095.63 = 86,243.13/x
3. Step 3: Cross multiply
   93,180.78x = 139,095.63 × 86,243.13
4. Step 4: Simplify right side
   93,180.78x = 11,996,042,500.52
5. Step 5: Solve for x
   x = 11,996,042,500.52/93,180.78
6. Step 6: Final answer
   x = 128,739.45