Finding the Fourth Proportional to 1,421.94, 2,128.32 and 875.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.94 : 2,128.32 = 875.22 : x
2. Step 2: Convert to fraction form
   1,421.94/2,128.32 = 875.22/x
3. Step 3: Cross multiply
   1,421.94x = 2,128.32 × 875.22
4. Step 4: Simplify right side
   1,421.94x = 1,862,748.23
5. Step 5: Solve for x
   x = 1,862,748.23/1,421.94
6. Step 6: Final answer
   x = 1,310.00