Finding the Fourth Proportional to 1,870.42, 2,804.91 and 553.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.42 : 2,804.91 = 553.78 : x
2. Step 2: Convert to fraction form
   1,870.42/2,804.91 = 553.78/x
3. Step 3: Cross multiply
   1,870.42x = 2,804.91 × 553.78
4. Step 4: Simplify right side
   1,870.42x = 1,553,303.06
5. Step 5: Solve for x
   x = 1,553,303.06/1,870.42
6. Step 6: Final answer
   x = 830.46