Finding the Fourth Proportional to 9,902.79, 13,665.78 and 5,426.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,902.79 : 13,665.78 = 5,426.42 : x
2. Step 2: Convert to fraction form
   9,902.79/13,665.78 = 5,426.42/x
3. Step 3: Cross multiply
   9,902.79x = 13,665.78 × 5,426.42
4. Step 4: Simplify right side
   9,902.79x = 74,156,193.58
5. Step 5: Solve for x
   x = 74,156,193.58/9,902.79
6. Step 6: Final answer
   x = 7,488.41