Finding the Fourth Proportional to 1,779.16, 2,670.18 and 913.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,779.16 : 2,670.18 = 913.72 : x
2. Step 2: Convert to fraction form
   1,779.16/2,670.18 = 913.72/x
3. Step 3: Cross multiply
   1,779.16x = 2,670.18 × 913.72
4. Step 4: Simplify right side
   1,779.16x = 2,439,796.87
5. Step 5: Solve for x
   x = 2,439,796.87/1,779.16
6. Step 6: Final answer
   x = 1,371.32