Finding the Fourth Proportional to 52,820.32, 72,892.28 and 28,947.20

Step by Step Solution

1. Step 1: Write the proportion equation
   52,820.32 : 72,892.28 = 28,947.20 : x
2. Step 2: Convert to fraction form
   52,820.32/72,892.28 = 28,947.20/x
3. Step 3: Cross multiply
   52,820.32x = 72,892.28 × 28,947.20
4. Step 4: Simplify right side
   52,820.32x = 2,110,027,407.62
5. Step 5: Solve for x
   x = 2,110,027,407.62/52,820.32
6. Step 6: Final answer
   x = 39,947.27