Finding the Fourth Proportional to 12,410.76, 17,129.46 and 7,870.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,410.76 : 17,129.46 = 7,870.50 : x
2. Step 2: Convert to fraction form
   12,410.76/17,129.46 = 7,870.50/x
3. Step 3: Cross multiply
   12,410.76x = 17,129.46 × 7,870.50
4. Step 4: Simplify right side
   12,410.76x = 134,817,414.93
5. Step 5: Solve for x
   x = 134,817,414.93/12,410.76
6. Step 6: Final answer
   x = 10,862.95