Finding the Fourth Proportional to 42,742.76, 64,128.72 and 23,023.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42,742.76 : 64,128.72 = 23,023.31 : x
2. Step 2: Convert to fraction form
   42,742.76/64,128.72 = 23,023.31/x
3. Step 3: Cross multiply
   42,742.76x = 64,128.72 × 23,023.31
4. Step 4: Simplify right side
   42,742.76x = 1,476,455,400.46
5. Step 5: Solve for x
   x = 1,476,455,400.46/42,742.76
6. Step 6: Final answer
   x = 34,542.82