Finding the Fourth Proportional to 1,422.10, 2,131.18 and 1,075.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.10 : 2,131.18 = 1,075.15 : x
2. Step 2: Convert to fraction form
   1,422.10/2,131.18 = 1,075.15/x
3. Step 3: Cross multiply
   1,422.10x = 2,131.18 × 1,075.15
4. Step 4: Simplify right side
   1,422.10x = 2,291,338.18
5. Step 5: Solve for x
   x = 2,291,338.18/1,422.10
6. Step 6: Final answer
   x = 1,611.24