Finding the Fourth Proportional to 10,055.72, 13,878.55 and 5,580.90

Step by Step Solution

1. Step 1: Write the proportion equation
   10,055.72 : 13,878.55 = 5,580.90 : x
2. Step 2: Convert to fraction form
   10,055.72/13,878.55 = 5,580.90/x
3. Step 3: Cross multiply
   10,055.72x = 13,878.55 × 5,580.90
4. Step 4: Simplify right side
   10,055.72x = 77,454,799.70
5. Step 5: Solve for x
   x = 77,454,799.70/10,055.72
6. Step 6: Final answer
   x = 7,702.56