Finding the Fourth Proportional to 100,111.90, 138,140.79 and 59,817.15

Step by Step Solution

1. Step 1: Write the proportion equation
   100,111.90 : 138,140.79 = 59,817.15 : x
2. Step 2: Convert to fraction form
   100,111.90/138,140.79 = 59,817.15/x
3. Step 3: Cross multiply
   100,111.90x = 138,140.79 × 59,817.15
4. Step 4: Simplify right side
   100,111.90x = 8,263,188,356.55
5. Step 5: Solve for x
   x = 8,263,188,356.55/100,111.90
6. Step 6: Final answer
   x = 82,539.52