Finding the Fourth Proportional to 1,385.32, 1,913.94 and 1,055.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.32 : 1,913.94 = 1,055.08 : x
2. Step 2: Convert to fraction form
   1,385.32/1,913.94 = 1,055.08/x
3. Step 3: Cross multiply
   1,385.32x = 1,913.94 × 1,055.08
4. Step 4: Simplify right side
   1,385.32x = 2,019,359.82
5. Step 5: Solve for x
   x = 2,019,359.82/1,385.32
6. Step 6: Final answer
   x = 1,457.68