Finding the Fourth Proportional to 12,798.32, 19,200.10 and 5,402.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,798.32 : 19,200.10 = 5,402.78 : x
2. Step 2: Convert to fraction form
   12,798.32/19,200.10 = 5,402.78/x
3. Step 3: Cross multiply
   12,798.32x = 19,200.10 × 5,402.78
4. Step 4: Simplify right side
   12,798.32x = 103,733,916.28
5. Step 5: Solve for x
   x = 103,733,916.28/12,798.32
6. Step 6: Final answer
   x = 8,105.28