Finding the Fourth Proportional to 1,472.07, 2,207.83 and 856.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,472.07 : 2,207.83 = 856.98 : x
2. Step 2: Convert to fraction form
   1,472.07/2,207.83 = 856.98/x
3. Step 3: Cross multiply
   1,472.07x = 2,207.83 × 856.98
4. Step 4: Simplify right side
   1,472.07x = 1,892,066.15
5. Step 5: Solve for x
   x = 1,892,066.15/1,472.07
6. Step 6: Final answer
   x = 1,285.31