Finding the Fourth Proportional to 1,417.83, 1,956.63 and 858.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.83 : 1,956.63 = 858.21 : x
2. Step 2: Convert to fraction form
   1,417.83/1,956.63 = 858.21/x
3. Step 3: Cross multiply
   1,417.83x = 1,956.63 × 858.21
4. Step 4: Simplify right side
   1,417.83x = 1,679,199.43
5. Step 5: Solve for x
   x = 1,679,199.43/1,417.83
6. Step 6: Final answer
   x = 1,184.34