Finding the Fourth Proportional to 100,531.02, 138,727.40 and 57,511.37

Step by Step Solution

1. Step 1: Write the proportion equation
   100,531.02 : 138,727.40 = 57,511.37 : x
2. Step 2: Convert to fraction form
   100,531.02/138,727.40 = 57,511.37/x
3. Step 3: Cross multiply
   100,531.02x = 138,727.40 × 57,511.37
4. Step 4: Simplify right side
   100,531.02x = 7,978,401,849.34
5. Step 5: Solve for x
   x = 7,978,401,849.34/100,531.02
6. Step 6: Final answer
   x = 79,362.59