Finding the Fourth Proportional to 81,189,756.72, 111,933,471.60 and 64,499,873.60

Step by Step Solution

1. Step 1: Write the proportion equation
   81,189,756.72 : 111,933,471.60 = 64,499,873.60 : x
2. Step 2: Convert to fraction form
   81,189,756.72/111,933,471.60 = 64,499,873.60/x
3. Step 3: Cross multiply
   81,189,756.72x = 111,933,471.60 × 64,499,873.60
4. Step 4: Simplify right side
   81,189,756.72x = 7,219,694,769,809,190
5. Step 5: Solve for x
   x = 7,219,694,769,809,190/81,189,756.72
6. Step 6: Final answer
   x = 88,923,714.78