Finding the Fourth Proportional to 31,103.86, 42,889.44 and 21,014.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,103.86 : 42,889.44 = 21,014.80 : x
2. Step 2: Convert to fraction form
   31,103.86/42,889.44 = 21,014.80/x
3. Step 3: Cross multiply
   31,103.86x = 42,889.44 × 21,014.80
4. Step 4: Simplify right side
   31,103.86x = 901,313,003.71
5. Step 5: Solve for x
   x = 901,313,003.71/31,103.86
6. Step 6: Final answer
   x = 28,977.53