Finding the Fourth Proportional to 9,905.55, 13,669.61 and 5,429.49

Step by Step Solution

1. Step 1: Write the proportion equation
   9,905.55 : 13,669.61 = 5,429.49 : x
2. Step 2: Convert to fraction form
   9,905.55/13,669.61 = 5,429.49/x
3. Step 3: Cross multiply
   9,905.55x = 13,669.61 × 5,429.49
4. Step 4: Simplify right side
   9,905.55x = 74,218,983.65
5. Step 5: Solve for x
   x = 74,218,983.65/9,905.55
6. Step 6: Final answer
   x = 7,492.67