Finding the Fourth Proportional to 31,719.60, 43,702.56 and 20,945.34

Step by Step Solution

1. Step 1: Write the proportion equation
   31,719.60 : 43,702.56 = 20,945.34 : x
2. Step 2: Convert to fraction form
   31,719.60/43,702.56 = 20,945.34/x
3. Step 3: Cross multiply
   31,719.60x = 43,702.56 × 20,945.34
4. Step 4: Simplify right side
   31,719.60x = 915,364,978.07
5. Step 5: Solve for x
   x = 915,364,978.07/31,719.60
6. Step 6: Final answer
   x = 28,858.02