Finding the Fourth Proportional to 1,382.34, 2,071.86 and 1,056.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.34 : 2,071.86 = 1,056.72 : x
2. Step 2: Convert to fraction form
   1,382.34/2,071.86 = 1,056.72/x
3. Step 3: Cross multiply
   1,382.34x = 2,071.86 × 1,056.72
4. Step 4: Simplify right side
   1,382.34x = 2,189,375.90
5. Step 5: Solve for x
   x = 2,189,375.90/1,382.34
6. Step 6: Final answer
   x = 1,583.82