Finding the Fourth Proportional to 91,601.91, 137,422.56 and 28,420.74

Step by Step Solution

1. Step 1: Write the proportion equation
   91,601.91 : 137,422.56 = 28,420.74 : x
2. Step 2: Convert to fraction form
   91,601.91/137,422.56 = 28,420.74/x
3. Step 3: Cross multiply
   91,601.91x = 137,422.56 × 28,420.74
4. Step 4: Simplify right side
   91,601.91x = 3,905,650,847.89
5. Step 5: Solve for x
   x = 3,905,650,847.89/91,601.91
6. Step 6: Final answer
   x = 42,637.22