Finding the Fourth Proportional to 9,985.30, 13,779.82 and 5,509.22

Step by Step Solution

1. Step 1: Write the proportion equation
   9,985.30 : 13,779.82 = 5,509.22 : x
2. Step 2: Convert to fraction form
   9,985.30/13,779.82 = 5,509.22/x
3. Step 3: Cross multiply
   9,985.30x = 13,779.82 × 5,509.22
4. Step 4: Simplify right side
   9,985.30x = 75,916,059.94
5. Step 5: Solve for x
   x = 75,916,059.94/9,985.30
6. Step 6: Final answer
   x = 7,602.78