Finding the Fourth Proportional to 13,142.72, 19,702.34 and 4,820.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.72 : 19,702.34 = 4,820.78 : x
2. Step 2: Convert to fraction form
   13,142.72/19,702.34 = 4,820.78/x
3. Step 3: Cross multiply
   13,142.72x = 19,702.34 × 4,820.78
4. Step 4: Simplify right side
   13,142.72x = 94,980,689.86
5. Step 5: Solve for x
   x = 94,980,689.86/13,142.72
6. Step 6: Final answer
   x = 7,226.87