Finding the Fourth Proportional to 42,989.58, 64,408.10 and 17,974.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,989.58 : 64,408.10 = 17,974.50 : x
2. Step 2: Convert to fraction form
   42,989.58/64,408.10 = 17,974.50/x
3. Step 3: Cross multiply
   42,989.58x = 64,408.10 × 17,974.50
4. Step 4: Simplify right side
   42,989.58x = 1,157,703,393.45
5. Step 5: Solve for x
   x = 1,157,703,393.45/42,989.58
6. Step 6: Final answer
   x = 26,929.86