Finding the Fourth Proportional to 31,079.60, 42,905.40 and 19,760.48

Step by Step Solution

1. Step 1: Write the proportion equation
   31,079.60 : 42,905.40 = 19,760.48 : x
2. Step 2: Convert to fraction form
   31,079.60/42,905.40 = 19,760.48/x
3. Step 3: Cross multiply
   31,079.60x = 42,905.40 × 19,760.48
4. Step 4: Simplify right side
   31,079.60x = 847,831,298.59
5. Step 5: Solve for x
   x = 847,831,298.59/31,079.60
6. Step 6: Final answer
   x = 27,279.35