Finding the Fourth Proportional to 42,687, 64,047.51 and 21,615.66

Step by Step Solution

1. Step 1: Write the proportion equation
   42,687 : 64,047.51 = 21,615.66 : x
2. Step 2: Convert to fraction form
   42,687/64,047.51 = 21,615.66/x
3. Step 3: Cross multiply
   42,687x = 64,047.51 × 21,615.66
4. Step 4: Simplify right side
   42,687x = 1,384,429,200.01
5. Step 5: Solve for x
   x = 1,384,429,200.01/42,687
6. Step 6: Final answer
   x = 32,432.10