Finding the Fourth Proportional to 1,570.77, 2,354.60 and 877.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.77 : 2,354.60 = 877.74 : x
2. Step 2: Convert to fraction form
   1,570.77/2,354.60 = 877.74/x
3. Step 3: Cross multiply
   1,570.77x = 2,354.60 × 877.74
4. Step 4: Simplify right side
   1,570.77x = 2,066,722.22
5. Step 5: Solve for x
   x = 2,066,722.22/1,570.77
6. Step 6: Final answer
   x = 1,315.74