Finding the Fourth Proportional to 91,601.10, 137,421.27 and 28,419.86

Step by Step Solution

1. Step 1: Write the proportion equation
   91,601.10 : 137,421.27 = 28,419.86 : x
2. Step 2: Convert to fraction form
   91,601.10/137,421.27 = 28,419.86/x
3. Step 3: Cross multiply
   91,601.10x = 137,421.27 × 28,419.86
4. Step 4: Simplify right side
   91,601.10x = 3,905,493,597.98
5. Step 5: Solve for x
   x = 3,905,493,597.98/91,601.10
6. Step 6: Final answer
   x = 42,635.88