Finding the Fourth Proportional to 1,985.31, 2,736.72 and 1,564.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,985.31 : 2,736.72 = 1,564.92 : x
2. Step 2: Convert to fraction form
   1,985.31/2,736.72 = 1,564.92/x
3. Step 3: Cross multiply
   1,985.31x = 2,736.72 × 1,564.92
4. Step 4: Simplify right side
   1,985.31x = 4,282,747.86
5. Step 5: Solve for x
   x = 4,282,747.86/1,985.31
6. Step 6: Final answer
   x = 2,157.22