Finding the Fourth Proportional to 8,781.60, 12,112.32 and 5,634.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,781.60 : 12,112.32 = 5,634.72 : x
2. Step 2: Convert to fraction form
   8,781.60/12,112.32 = 5,634.72/x
3. Step 3: Cross multiply
   8,781.60x = 12,112.32 × 5,634.72
4. Step 4: Simplify right side
   8,781.60x = 68,249,531.75
5. Step 5: Solve for x
   x = 68,249,531.75/8,781.60
6. Step 6: Final answer
   x = 7,771.88