Finding the Fourth Proportional to 9,900.39, 14,856.66 and 5,223.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.39 : 14,856.66 = 5,223.87 : x
2. Step 2: Convert to fraction form
   9,900.39/14,856.66 = 5,223.87/x
3. Step 3: Cross multiply
   9,900.39x = 14,856.66 × 5,223.87
4. Step 4: Simplify right side
   9,900.39x = 77,609,260.47
5. Step 5: Solve for x
   x = 77,609,260.47/9,900.39
6. Step 6: Final answer
   x = 7,839.01