Finding the Fourth Proportional to 1,672.05, 2,502.72 and 1,056.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.05 : 2,502.72 = 1,056.30 : x
2. Step 2: Convert to fraction form
   1,672.05/2,502.72 = 1,056.30/x
3. Step 3: Cross multiply
   1,672.05x = 2,502.72 × 1,056.30
4. Step 4: Simplify right side
   1,672.05x = 2,643,623.14
5. Step 5: Solve for x
   x = 2,643,623.14/1,672.05
6. Step 6: Final answer
   x = 1,581.07