Finding the Fourth Proportional to 9,123.49, 12,590.40 and 4,931.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,123.49 : 12,590.40 = 4,931.74 : x
2. Step 2: Convert to fraction form
   9,123.49/12,590.40 = 4,931.74/x
3. Step 3: Cross multiply
   9,123.49x = 12,590.40 × 4,931.74
4. Step 4: Simplify right side
   9,123.49x = 62,092,579.30
5. Step 5: Solve for x
   x = 62,092,579.30/9,123.49
6. Step 6: Final answer
   x = 6,805.79