Finding the Fourth Proportional to 1,071.63, 1,468.94 and 1,057.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.63 : 1,468.94 = 1,057.05 : x
2. Step 2: Convert to fraction form
   1,071.63/1,468.94 = 1,057.05/x
3. Step 3: Cross multiply
   1,071.63x = 1,468.94 × 1,057.05
4. Step 4: Simplify right side
   1,071.63x = 1,552,737.74
5. Step 5: Solve for x
   x = 1,552,737.74/1,071.63
6. Step 6: Final answer
   x = 1,448.95