Finding the Fourth Proportional to 45,820.80, 68,710.72 and 12,981.12

Step by Step Solution

1. Step 1: Write the proportion equation
   45,820.80 : 68,710.72 = 12,981.12 : x
2. Step 2: Convert to fraction form
   45,820.80/68,710.72 = 12,981.12/x
3. Step 3: Cross multiply
   45,820.80x = 68,710.72 × 12,981.12
4. Step 4: Simplify right side
   45,820.80x = 891,942,101.61
5. Step 5: Solve for x
   x = 891,942,101.61/45,820.80
6. Step 6: Final answer
   x = 19,465.88