Finding the Fourth Proportional to 1,385.58, 1,912.83 and 1,070.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.58 : 1,912.83 = 1,070.16 : x
2. Step 2: Convert to fraction form
   1,385.58/1,912.83 = 1,070.16/x
3. Step 3: Cross multiply
   1,385.58x = 1,912.83 × 1,070.16
4. Step 4: Simplify right side
   1,385.58x = 2,047,034.15
5. Step 5: Solve for x
   x = 2,047,034.15/1,385.58
6. Step 6: Final answer
   x = 1,477.38