Finding the Fourth Proportional to 1,392.18, 2,090.34 and 875.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.18 : 2,090.34 = 875.43 : x
2. Step 2: Convert to fraction form
   1,392.18/2,090.34 = 875.43/x
3. Step 3: Cross multiply
   1,392.18x = 2,090.34 × 875.43
4. Step 4: Simplify right side
   1,392.18x = 1,829,946.35
5. Step 5: Solve for x
   x = 1,829,946.35/1,392.18
6. Step 6: Final answer
   x = 1,314.45