Finding the Fourth Proportional to 42,306.86, 63,439.15 and 13,840.09

Step by Step Solution

1. Step 1: Write the proportion equation
   42,306.86 : 63,439.15 = 13,840.09 : x
2. Step 2: Convert to fraction form
   42,306.86/63,439.15 = 13,840.09/x
3. Step 3: Cross multiply
   42,306.86x = 63,439.15 × 13,840.09
4. Step 4: Simplify right side
   42,306.86x = 878,003,642.12
5. Step 5: Solve for x
   x = 878,003,642.12/42,306.86
6. Step 6: Final answer
   x = 20,753.22