Finding the Fourth Proportional to 42,658.52, 63,987.80 and 21,868.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,658.52 : 63,987.80 = 21,868.76 : x
2. Step 2: Convert to fraction form
   42,658.52/63,987.80 = 21,868.76/x
3. Step 3: Cross multiply
   42,658.52x = 63,987.80 × 21,868.76
4. Step 4: Simplify right side
   42,658.52x = 1,399,333,841.13
5. Step 5: Solve for x
   x = 1,399,333,841.13/42,658.52
6. Step 6: Final answer
   x = 32,803.15