Finding the Fourth Proportional to 58,431, 87,670.66 and 28,020.72

Step by Step Solution

1. Step 1: Write the proportion equation
   58,431 : 87,670.66 = 28,020.72 : x
2. Step 2: Convert to fraction form
   58,431/87,670.66 = 28,020.72/x
3. Step 3: Cross multiply
   58,431x = 87,670.66 × 28,020.72
4. Step 4: Simplify right side
   58,431x = 2,456,595,016.08
5. Step 5: Solve for x
   x = 2,456,595,016.08/58,431
6. Step 6: Final answer
   x = 42,042.67