Finding the Fourth Proportional to 42,931.02, 64,403.43 and 20,746.03

Step by Step Solution

1. Step 1: Write the proportion equation
   42,931.02 : 64,403.43 = 20,746.03 : x
2. Step 2: Convert to fraction form
   42,931.02/64,403.43 = 20,746.03/x
3. Step 3: Cross multiply
   42,931.02x = 64,403.43 × 20,746.03
4. Step 4: Simplify right side
   42,931.02x = 1,336,115,490.88
5. Step 5: Solve for x
   x = 1,336,115,490.88/42,931.02
6. Step 6: Final answer
   x = 31,122.38