Finding the Fourth Proportional to 1,385.88, 1,913.45 and 1,056.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.88 : 1,913.45 = 1,056.01 : x
2. Step 2: Convert to fraction form
   1,385.88/1,913.45 = 1,056.01/x
3. Step 3: Cross multiply
   1,385.88x = 1,913.45 × 1,056.01
4. Step 4: Simplify right side
   1,385.88x = 2,020,622.33
5. Step 5: Solve for x
   x = 2,020,622.33/1,385.88
6. Step 6: Final answer
   x = 1,458.01