Finding the Fourth Proportional to 5,279.60, 7,920.52 and 1,581.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,279.60 : 7,920.52 = 1,581.86 : x
2. Step 2: Convert to fraction form
   5,279.60/7,920.52 = 1,581.86/x
3. Step 3: Cross multiply
   5,279.60x = 7,920.52 × 1,581.86
4. Step 4: Simplify right side
   5,279.60x = 12,529,169.61
5. Step 5: Solve for x
   x = 12,529,169.61/5,279.60
6. Step 6: Final answer
   x = 2,373.13