Finding the Fourth Proportional to 1,185.72, 1,779.48 and 536.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.72 : 1,779.48 = 536.91 : x
2. Step 2: Convert to fraction form
   1,185.72/1,779.48 = 536.91/x
3. Step 3: Cross multiply
   1,185.72x = 1,779.48 × 536.91
4. Step 4: Simplify right side
   1,185.72x = 955,420.61
5. Step 5: Solve for x
   x = 955,420.61/1,185.72
6. Step 6: Final answer
   x = 805.77