Finding the Fourth Proportional to 42,828,580.00, 64,245,361.98 and 12,120,590.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,828,580.00 : 64,245,361.98 = 12,120,590.42 : x
2. Step 2: Convert to fraction form
   42,828,580.00/64,245,361.98 = 12,120,590.42/x
3. Step 3: Cross multiply
   42,828,580.00x = 64,245,361.98 × 12,120,590.42
4. Step 4: Simplify right side
   42,828,580.00x = 778,691,718,909,365.75
5. Step 5: Solve for x
   x = 778,691,718,909,365.75/42,828,580.00
6. Step 6: Final answer
   x = 18,181,590.86