Finding the Fourth Proportional to 1,258.34, 1,886.00 and 436.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.34 : 1,886.00 = 436.15 : x
2. Step 2: Convert to fraction form
   1,258.34/1,886.00 = 436.15/x
3. Step 3: Cross multiply
   1,258.34x = 1,886.00 × 436.15
4. Step 4: Simplify right side
   1,258.34x = 822,581.53
5. Step 5: Solve for x
   x = 822,581.53/1,258.34
6. Step 6: Final answer
   x = 653.71