Finding the Fourth Proportional to 72,432.02, 108,638.78 and 28,028.39

Step by Step Solution

1. Step 1: Write the proportion equation
   72,432.02 : 108,638.78 = 28,028.39 : x
2. Step 2: Convert to fraction form
   72,432.02/108,638.78 = 28,028.39/x
3. Step 3: Cross multiply
   72,432.02x = 108,638.78 × 28,028.39
4. Step 4: Simplify right side
   72,432.02x = 3,044,969,411.63
5. Step 5: Solve for x
   x = 3,044,969,411.63/72,432.02
6. Step 6: Final answer
   x = 42,038.99