Finding the Fourth Proportional to 100,131.56, 138,134.90 and 57,665.50

Step by Step Solution

1. Step 1: Write the proportion equation
   100,131.56 : 138,134.90 = 57,665.50 : x
2. Step 2: Convert to fraction form
   100,131.56/138,134.90 = 57,665.50/x
3. Step 3: Cross multiply
   100,131.56x = 138,134.90 × 57,665.50
4. Step 4: Simplify right side
   100,131.56x = 7,965,618,075.95
5. Step 5: Solve for x
   x = 7,965,618,075.95/100,131.56
6. Step 6: Final answer
   x = 79,551.52