Finding the Fourth Proportional to 28,566, 42,851.70 and 7,789.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,566 : 42,851.70 = 7,789.50 : x
2. Step 2: Convert to fraction form
   28,566/42,851.70 = 7,789.50/x
3. Step 3: Cross multiply
   28,566x = 42,851.70 × 7,789.50
4. Step 4: Simplify right side
   28,566x = 333,793,317.15
5. Step 5: Solve for x
   x = 333,793,317.15/28,566
6. Step 6: Final answer
   x = 11,684.99