Finding the Fourth Proportional to 42,915.86, 64,361.48 and 12,933

Step by Step Solution

1. Step 1: Write the proportion equation
   42,915.86 : 64,361.48 = 12,933 : x
2. Step 2: Convert to fraction form
   42,915.86/64,361.48 = 12,933/x
3. Step 3: Cross multiply
   42,915.86x = 64,361.48 × 12,933
4. Step 4: Simplify right side
   42,915.86x = 832,387,020.84
5. Step 5: Solve for x
   x = 832,387,020.84/42,915.86
6. Step 6: Final answer
   x = 19,395.79