Finding the Fourth Proportional to 42,085.88, 63,139.39 and 12,100.17

Step by Step Solution

1. Step 1: Write the proportion equation
   42,085.88 : 63,139.39 = 12,100.17 : x
2. Step 2: Convert to fraction form
   42,085.88/63,139.39 = 12,100.17/x
3. Step 3: Cross multiply
   42,085.88x = 63,139.39 × 12,100.17
4. Step 4: Simplify right side
   42,085.88x = 763,997,352.70
5. Step 5: Solve for x
   x = 763,997,352.70/42,085.88
6. Step 6: Final answer
   x = 18,153.29