Finding the Fourth Proportional to 10,858.18, 16,281.60 and 5,312.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,858.18 : 16,281.60 = 5,312.50 : x
2. Step 2: Convert to fraction form
   10,858.18/16,281.60 = 5,312.50/x
3. Step 3: Cross multiply
   10,858.18x = 16,281.60 × 5,312.50
4. Step 4: Simplify right side
   10,858.18x = 86,496,000
5. Step 5: Solve for x
   x = 86,496,000/10,858.18
6. Step 6: Final answer
   x = 7,965.98