Finding the Fourth Proportional to 1,886.64, 2,827.12 and 790.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,886.64 : 2,827.12 = 790.72 : x
2. Step 2: Convert to fraction form
   1,886.64/2,827.12 = 790.72/x
3. Step 3: Cross multiply
   1,886.64x = 2,827.12 × 790.72
4. Step 4: Simplify right side
   1,886.64x = 2,235,460.33
5. Step 5: Solve for x
   x = 2,235,460.33/1,886.64
6. Step 6: Final answer
   x = 1,184.89