Finding the Fourth Proportional to 1,131.80, 1,696.19 and 612

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.80 : 1,696.19 = 612 : x
2. Step 2: Convert to fraction form
   1,131.80/1,696.19 = 612/x
3. Step 3: Cross multiply
   1,131.80x = 1,696.19 × 612
4. Step 4: Simplify right side
   1,131.80x = 1,038,065.22
5. Step 5: Solve for x
   x = 1,038,065.22/1,131.80
6. Step 6: Final answer
   x = 917.18