Finding the Fourth Proportional to 42,740.76, 64,125.72 and 23,021.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42,740.76 : 64,125.72 = 23,021.31 : x
2. Step 2: Convert to fraction form
   42,740.76/64,125.72 = 23,021.31/x
3. Step 3: Cross multiply
   42,740.76x = 64,125.72 × 23,021.31
4. Step 4: Simplify right side
   42,740.76x = 1,476,258,079.09
5. Step 5: Solve for x
   x = 1,476,258,079.09/42,740.76
6. Step 6: Final answer
   x = 34,539.82