Finding the Fourth Proportional to 9,902.06, 13,663.98 and 5,425.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,902.06 : 13,663.98 = 5,425.72 : x
2. Step 2: Convert to fraction form
   9,902.06/13,663.98 = 5,425.72/x
3. Step 3: Cross multiply
   9,902.06x = 13,663.98 × 5,425.72
4. Step 4: Simplify right side
   9,902.06x = 74,136,929.57
5. Step 5: Solve for x
   x = 74,136,929.57/9,902.06
6. Step 6: Final answer
   x = 7,487.02