Finding the Fourth Proportional to 1,870.32, 2,803.59 and 830.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.32 : 2,803.59 = 830.88 : x
2. Step 2: Convert to fraction form
   1,870.32/2,803.59 = 830.88/x
3. Step 3: Cross multiply
   1,870.32x = 2,803.59 × 830.88
4. Step 4: Simplify right side
   1,870.32x = 2,329,446.86
5. Step 5: Solve for x
   x = 2,329,446.86/1,870.32
6. Step 6: Final answer
   x = 1,245.48