Finding the Fourth Proportional to 1,131.76, 1,700.52 and 645.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.76 : 1,700.52 = 645.22 : x
2. Step 2: Convert to fraction form
   1,131.76/1,700.52 = 645.22/x
3. Step 3: Cross multiply
   1,131.76x = 1,700.52 × 645.22
4. Step 4: Simplify right side
   1,131.76x = 1,097,209.51
5. Step 5: Solve for x
   x = 1,097,209.51/1,131.76
6. Step 6: Final answer
   x = 969.47