Finding the Fourth Proportional to 1,314.18, 1,971.32 and 436.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,314.18 : 1,971.32 = 436.72 : x
2. Step 2: Convert to fraction form
   1,314.18/1,971.32 = 436.72/x
3. Step 3: Cross multiply
   1,314.18x = 1,971.32 × 436.72
4. Step 4: Simplify right side
   1,314.18x = 860,914.87
5. Step 5: Solve for x
   x = 860,914.87/1,314.18
6. Step 6: Final answer
   x = 655.10