Finding the Fourth Proportional to 2,390.60, 3,587.34 and 929.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.60 : 3,587.34 = 929.72 : x
2. Step 2: Convert to fraction form
   2,390.60/3,587.34 = 929.72/x
3. Step 3: Cross multiply
   2,390.60x = 3,587.34 × 929.72
4. Step 4: Simplify right side
   2,390.60x = 3,335,221.74
5. Step 5: Solve for x
   x = 3,335,221.74/2,390.60
6. Step 6: Final answer
   x = 1,395.14