Finding the Fourth Proportional to 28,128.84, 42,199.96 and 14,978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,128.84 : 42,199.96 = 14,978.50 : x
2. Step 2: Convert to fraction form
   28,128.84/42,199.96 = 14,978.50/x
3. Step 3: Cross multiply
   28,128.84x = 42,199.96 × 14,978.50
4. Step 4: Simplify right side
   28,128.84x = 632,092,100.86
5. Step 5: Solve for x
   x = 632,092,100.86/28,128.84
6. Step 6: Final answer
   x = 22,471.32