Finding the Fourth Proportional to 42,278.01, 58,275.89 and 28,661.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42,278.01 : 58,275.89 = 28,661.88 : x
2. Step 2: Convert to fraction form
   42,278.01/58,275.89 = 28,661.88/x
3. Step 3: Cross multiply
   42,278.01x = 58,275.89 × 28,661.88
4. Step 4: Simplify right side
   42,278.01x = 1,670,296,910.00
5. Step 5: Solve for x
   x = 1,670,296,910.00/42,278.01
6. Step 6: Final answer
   x = 39,507.47