Finding the Fourth Proportional to 9,985.50, 14,988.17 and 5,305.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,985.50 : 14,988.17 = 5,305.55 : x
2. Step 2: Convert to fraction form
   9,985.50/14,988.17 = 5,305.55/x
3. Step 3: Cross multiply
   9,985.50x = 14,988.17 × 5,305.55
4. Step 4: Simplify right side
   9,985.50x = 79,520,485.34
5. Step 5: Solve for x
   x = 79,520,485.34/9,985.50
6. Step 6: Final answer
   x = 7,963.60