Finding the Fourth Proportional to 1,130.34, 1,694.52 and 642.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,130.34 : 1,694.52 = 642.72 : x
2. Step 2: Convert to fraction form
   1,130.34/1,694.52 = 642.72/x
3. Step 3: Cross multiply
   1,130.34x = 1,694.52 × 642.72
4. Step 4: Simplify right side
   1,130.34x = 1,089,101.89
5. Step 5: Solve for x
   x = 1,089,101.89/1,130.34
6. Step 6: Final answer
   x = 963.52