Finding the Fourth Proportional to 10,071.59, 13,900.78 and 6,435.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,071.59 : 13,900.78 = 6,435.31 : x
2. Step 2: Convert to fraction form
   10,071.59/13,900.78 = 6,435.31/x
3. Step 3: Cross multiply
   10,071.59x = 13,900.78 × 6,435.31
4. Step 4: Simplify right side
   10,071.59x = 89,455,785.75
5. Step 5: Solve for x
   x = 89,455,785.75/10,071.59
6. Step 6: Final answer
   x = 8,881.99