Finding the Fourth Proportional to 9,985.53, 13,779.32 and 5,509.29

Step by Step Solution

1. Step 1: Write the proportion equation
   9,985.53 : 13,779.32 = 5,509.29 : x
2. Step 2: Convert to fraction form
   9,985.53/13,779.32 = 5,509.29/x
3. Step 3: Cross multiply
   9,985.53x = 13,779.32 × 5,509.29
4. Step 4: Simplify right side
   9,985.53x = 75,914,242.34
5. Step 5: Solve for x
   x = 75,914,242.34/9,985.53
6. Step 6: Final answer
   x = 7,602.42