Finding the Fourth Proportional to 42,915.69, 64,383.48 and 13,331.93

Step by Step Solution

1. Step 1: Write the proportion equation
   42,915.69 : 64,383.48 = 13,331.93 : x
2. Step 2: Convert to fraction form
   42,915.69/64,383.48 = 13,331.93/x
3. Step 3: Cross multiply
   42,915.69x = 64,383.48 × 13,331.93
4. Step 4: Simplify right side
   42,915.69x = 858,355,726.60
5. Step 5: Solve for x
   x = 858,355,726.60/42,915.69
6. Step 6: Final answer
   x = 20,000.98