Finding the Fourth Proportional to 28,440.86, 42,656.43 and 7,659.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,440.86 : 42,656.43 = 7,659.50 : x
2. Step 2: Convert to fraction form
   28,440.86/42,656.43 = 7,659.50/x
3. Step 3: Cross multiply
   28,440.86x = 42,656.43 × 7,659.50
4. Step 4: Simplify right side
   28,440.86x = 326,726,925.59
5. Step 5: Solve for x
   x = 326,726,925.59/28,440.86
6. Step 6: Final answer
   x = 11,487.94