Finding the Fourth Proportional to 31,103.60, 42,889.06 and 21,014.52

Step by Step Solution

1. Step 1: Write the proportion equation
   31,103.60 : 42,889.06 = 21,014.52 : x
2. Step 2: Convert to fraction form
   31,103.60/42,889.06 = 21,014.52/x
3. Step 3: Cross multiply
   31,103.60x = 42,889.06 × 21,014.52
4. Step 4: Simplify right side
   31,103.60x = 901,293,009.15
5. Step 5: Solve for x
   x = 901,293,009.15/31,103.60
6. Step 6: Final answer
   x = 28,977.13