Finding the Fourth Proportional to 1,187.34, 1,779.40 and 753.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,187.34 : 1,779.40 = 753.72 : x
2. Step 2: Convert to fraction form
   1,187.34/1,779.40 = 753.72/x
3. Step 3: Cross multiply
   1,187.34x = 1,779.40 × 753.72
4. Step 4: Simplify right side
   1,187.34x = 1,341,169.37
5. Step 5: Solve for x
   x = 1,341,169.37/1,187.34
6. Step 6: Final answer
   x = 1,129.56