Finding the Fourth Proportional to 42,705,686.40, 64,052,308.80 and 12,410,390.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,705,686.40 : 64,052,308.80 = 12,410,390.40 : x
2. Step 2: Convert to fraction form
   42,705,686.40/64,052,308.80 = 12,410,390.40/x
3. Step 3: Cross multiply
   42,705,686.40x = 64,052,308.80 × 12,410,390.40
4. Step 4: Simplify right side
   42,705,686.40x = 794,914,158,229,355.50
5. Step 5: Solve for x
   x = 794,914,158,229,355.50/42,705,686.40
6. Step 6: Final answer
   x = 18,613,777.82