Finding the Fourth Proportional to 9,902.74, 13,665.78 and 5,710.99

Step by Step Solution

1. Step 1: Write the proportion equation
   9,902.74 : 13,665.78 = 5,710.99 : x
2. Step 2: Convert to fraction form
   9,902.74/13,665.78 = 5,710.99/x
3. Step 3: Cross multiply
   9,902.74x = 13,665.78 × 5,710.99
4. Step 4: Simplify right side
   9,902.74x = 78,045,186.91
5. Step 5: Solve for x
   x = 78,045,186.91/9,902.74
6. Step 6: Final answer
   x = 7,881.17