Finding the Fourth Proportional to 1,312.80, 1,811.52 and 1,050.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,312.80 : 1,811.52 = 1,050.72 : x
2. Step 2: Convert to fraction form
   1,312.80/1,811.52 = 1,050.72/x
3. Step 3: Cross multiply
   1,312.80x = 1,811.52 × 1,050.72
4. Step 4: Simplify right side
   1,312.80x = 1,903,400.29
5. Step 5: Solve for x
   x = 1,903,400.29/1,312.80
6. Step 6: Final answer
   x = 1,449.88