Finding the Fourth Proportional to 28,426.89, 42,642.38 and 8,702.88

Step by Step Solution

1. Step 1: Write the proportion equation
   28,426.89 : 42,642.38 = 8,702.88 : x
2. Step 2: Convert to fraction form
   28,426.89/42,642.38 = 8,702.88/x
3. Step 3: Cross multiply
   28,426.89x = 42,642.38 × 8,702.88
4. Step 4: Simplify right side
   28,426.89x = 371,111,516.05
5. Step 5: Solve for x
   x = 371,111,516.05/28,426.89
6. Step 6: Final answer
   x = 13,054.95