Finding the Fourth Proportional to 70,945.21, 106,434.52 and 21,025.72

Step by Step Solution

1. Step 1: Write the proportion equation
   70,945.21 : 106,434.52 = 21,025.72 : x
2. Step 2: Convert to fraction form
   70,945.21/106,434.52 = 21,025.72/x
3. Step 3: Cross multiply
   70,945.21x = 106,434.52 × 21,025.72
4. Step 4: Simplify right side
   70,945.21x = 2,237,862,097.20
5. Step 5: Solve for x
   x = 2,237,862,097.20/70,945.21
6. Step 6: Final answer
   x = 31,543.53