Finding the Fourth Proportional to 9,985.29, 13,780.40 and 5,737.05

Step by Step Solution

1. Step 1: Write the proportion equation
   9,985.29 : 13,780.40 = 5,737.05 : x
2. Step 2: Convert to fraction form
   9,985.29/13,780.40 = 5,737.05/x
3. Step 3: Cross multiply
   9,985.29x = 13,780.40 × 5,737.05
4. Step 4: Simplify right side
   9,985.29x = 79,058,843.82
5. Step 5: Solve for x
   x = 79,058,843.82/9,985.29
6. Step 6: Final answer
   x = 7,917.53