Finding the Fourth Proportional to 42,483.60, 63,729.72 and 12,908.88

Step by Step Solution

1. Step 1: Write the proportion equation
   42,483.60 : 63,729.72 = 12,908.88 : x
2. Step 2: Convert to fraction form
   42,483.60/63,729.72 = 12,908.88/x
3. Step 3: Cross multiply
   42,483.60x = 63,729.72 × 12,908.88
4. Step 4: Simplify right side
   42,483.60x = 822,679,307.91
5. Step 5: Solve for x
   x = 822,679,307.91/42,483.60
6. Step 6: Final answer
   x = 19,364.63