Finding the Fourth Proportional to 9,905.56, 13,669.59 and 5,429.59

Step by Step Solution

1. Step 1: Write the proportion equation
   9,905.56 : 13,669.59 = 5,429.59 : x
2. Step 2: Convert to fraction form
   9,905.56/13,669.59 = 5,429.59/x
3. Step 3: Cross multiply
   9,905.56x = 13,669.59 × 5,429.59
4. Step 4: Simplify right side
   9,905.56x = 74,220,269.17
5. Step 5: Solve for x
   x = 74,220,269.17/9,905.56
6. Step 6: Final answer
   x = 7,492.79