Finding the Fourth Proportional to 1,780.83, 2,670.94 and 610.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.83 : 2,670.94 = 610.72 : x
2. Step 2: Convert to fraction form
   1,780.83/2,670.94 = 610.72/x
3. Step 3: Cross multiply
   1,780.83x = 2,670.94 × 610.72
4. Step 4: Simplify right side
   1,780.83x = 1,631,196.48
5. Step 5: Solve for x
   x = 1,631,196.48/1,780.83
6. Step 6: Final answer
   x = 915.98