Finding the Fourth Proportional to 42,738.31, 64,051.62 and 30,931.84

Step by Step Solution

1. Step 1: Write the proportion equation
   42,738.31 : 64,051.62 = 30,931.84 : x
2. Step 2: Convert to fraction form
   42,738.31/64,051.62 = 30,931.84/x
3. Step 3: Cross multiply
   42,738.31x = 64,051.62 × 30,931.84
4. Step 4: Simplify right side
   42,738.31x = 1,981,234,461.58
5. Step 5: Solve for x
   x = 1,981,234,461.58/42,738.31
6. Step 6: Final answer
   x = 46,357.34