Finding the Fourth Proportional to 52,312.04, 72,189.77 and 28,439.31

Step by Step Solution

1. Step 1: Write the proportion equation
   52,312.04 : 72,189.77 = 28,439.31 : x
2. Step 2: Convert to fraction form
   52,312.04/72,189.77 = 28,439.31/x
3. Step 3: Cross multiply
   52,312.04x = 72,189.77 × 28,439.31
4. Step 4: Simplify right side
   52,312.04x = 2,053,027,105.66
5. Step 5: Solve for x
   x = 2,053,027,105.66/52,312.04
6. Step 6: Final answer
   x = 39,245.79