Finding the Fourth Proportional to 8,978.08, 13,461.04 and 3,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.08 : 13,461.04 = 3,131.50 : x
2. Step 2: Convert to fraction form
   8,978.08/13,461.04 = 3,131.50/x
3. Step 3: Cross multiply
   8,978.08x = 13,461.04 × 3,131.50
4. Step 4: Simplify right side
   8,978.08x = 42,153,246.76
5. Step 5: Solve for x
   x = 42,153,246.76/8,978.08
6. Step 6: Final answer
   x = 4,695.13