Finding the Fourth Proportional to 42,087.86, 63,139.38 and 12,100.65

Step by Step Solution

1. Step 1: Write the proportion equation
   42,087.86 : 63,139.38 = 12,100.65 : x
2. Step 2: Convert to fraction form
   42,087.86/63,139.38 = 12,100.65/x
3. Step 3: Cross multiply
   42,087.86x = 63,139.38 × 12,100.65
4. Step 4: Simplify right side
   42,087.86x = 764,027,538.60
5. Step 5: Solve for x
   x = 764,027,538.60/42,087.86
6. Step 6: Final answer
   x = 18,153.16