Finding the Fourth Proportional to 2,931.31, 4,393.86 and 1,055.95

Step by Step Solution

1. Step 1: Write the proportion equation
   2,931.31 : 4,393.86 = 1,055.95 : x
2. Step 2: Convert to fraction form
   2,931.31/4,393.86 = 1,055.95/x
3. Step 3: Cross multiply
   2,931.31x = 4,393.86 × 1,055.95
4. Step 4: Simplify right side
   2,931.31x = 4,639,696.47
5. Step 5: Solve for x
   x = 4,639,696.47/2,931.31
6. Step 6: Final answer
   x = 1,582.81