Finding the Fourth Proportional to 28,435.58, 42,659.49 and 8,715.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,435.58 : 42,659.49 = 8,715.50 : x
2. Step 2: Convert to fraction form
   28,435.58/42,659.49 = 8,715.50/x
3. Step 3: Cross multiply
   28,435.58x = 42,659.49 × 8,715.50
4. Step 4: Simplify right side
   28,435.58x = 371,798,785.10
5. Step 5: Solve for x
   x = 371,798,785.10/28,435.58
6. Step 6: Final answer
   x = 13,075.13