Finding the Fourth Proportional to 9,916.86, 14,870.06 and 5,239.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,916.86 : 14,870.06 = 5,239.38 : x
2. Step 2: Convert to fraction form
   9,916.86/14,870.06 = 5,239.38/x
3. Step 3: Cross multiply
   9,916.86x = 14,870.06 × 5,239.38
4. Step 4: Simplify right side
   9,916.86x = 77,909,868.77
5. Step 5: Solve for x
   x = 77,909,868.77/9,916.86
6. Step 6: Final answer
   x = 7,856.30