Finding the Fourth Proportional to 100,359.77, 138,483.72 and 57,342.05

Step by Step Solution

1. Step 1: Write the proportion equation
   100,359.77 : 138,483.72 = 57,342.05 : x
2. Step 2: Convert to fraction form
   100,359.77/138,483.72 = 57,342.05/x
3. Step 3: Cross multiply
   100,359.77x = 138,483.72 × 57,342.05
4. Step 4: Simplify right side
   100,359.77x = 7,940,939,704.01
5. Step 5: Solve for x
   x = 7,940,939,704.01/100,359.77
6. Step 6: Final answer
   x = 79,124.73