Finding the Fourth Proportional to 91,601.98, 137,422.58 and 28,420.74

Step by Step Solution

1. Step 1: Write the proportion equation
   91,601.98 : 137,422.58 = 28,420.74 : x
2. Step 2: Convert to fraction form
   91,601.98/137,422.58 = 28,420.74/x
3. Step 3: Cross multiply
   91,601.98x = 137,422.58 × 28,420.74
4. Step 4: Simplify right side
   91,601.98x = 3,905,651,416.31
5. Step 5: Solve for x
   x = 3,905,651,416.31/91,601.98
6. Step 6: Final answer
   x = 42,637.19