Finding the Fourth Proportional to 1,207.60, 1,810.72 and 557.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,207.60 : 1,810.72 = 557.53 : x
2. Step 2: Convert to fraction form
   1,207.60/1,810.72 = 557.53/x
3. Step 3: Cross multiply
   1,207.60x = 1,810.72 × 557.53
4. Step 4: Simplify right side
   1,207.60x = 1,009,530.72
5. Step 5: Solve for x
   x = 1,009,530.72/1,207.60
6. Step 6: Final answer
   x = 835.98