Finding the Fourth Proportional to 91,605, 137,427.08 and 28,423.76

Step by Step Solution

1. Step 1: Write the proportion equation
   91,605 : 137,427.08 = 28,423.76 : x
2. Step 2: Convert to fraction form
   91,605/137,427.08 = 28,423.76/x
3. Step 3: Cross multiply
   91,605x = 137,427.08 × 28,423.76
4. Step 4: Simplify right side
   91,605x = 3,906,194,339.42
5. Step 5: Solve for x
   x = 3,906,194,339.42/91,605
6. Step 6: Final answer
   x = 42,641.72