Finding the Fourth Proportional to 42,851,721.60, 64,278,105.12 and 12,560,196.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,851,721.60 : 64,278,105.12 = 12,560,196.96 : x
2. Step 2: Convert to fraction form
   42,851,721.60/64,278,105.12 = 12,560,196.96/x
3. Step 3: Cross multiply
   42,851,721.60x = 64,278,105.12 × 12,560,196.96
4. Step 4: Simplify right side
   42,851,721.60x = 807,345,660,522,784.50
5. Step 5: Solve for x
   x = 807,345,660,522,784.50/42,851,721.60
6. Step 6: Final answer
   x = 18,840,448.65