Finding the Fourth Proportional to 9,981.40, 13,773.86 and 5,729.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,981.40 : 13,773.86 = 5,729.50 : x
2. Step 2: Convert to fraction form
   9,981.40/13,773.86 = 5,729.50/x
3. Step 3: Cross multiply
   9,981.40x = 13,773.86 × 5,729.50
4. Step 4: Simplify right side
   9,981.40x = 78,917,302.22
5. Step 5: Solve for x
   x = 78,917,302.22/9,981.40
6. Step 6: Final answer
   x = 7,906.44