Finding the Fourth Proportional to 10,435.92, 14,315.80 and 9,870.99

Step by Step Solution

1. Step 1: Write the proportion equation
   10,435.92 : 14,315.80 = 9,870.99 : x
2. Step 2: Convert to fraction form
   10,435.92/14,315.80 = 9,870.99/x
3. Step 3: Cross multiply
   10,435.92x = 14,315.80 × 9,870.99
4. Step 4: Simplify right side
   10,435.92x = 141,311,093.96
5. Step 5: Solve for x
   x = 141,311,093.96/10,435.92
6. Step 6: Final answer
   x = 13,540.84