Finding the Fourth Proportional to 81,189,499.64, 111,933,117.95 and 64,499,616.50

Step by Step Solution

1. Step 1: Write the proportion equation
   81,189,499.64 : 111,933,117.95 = 64,499,616.50 : x
2. Step 2: Convert to fraction form
   81,189,499.64/111,933,117.95 = 64,499,616.50/x
3. Step 3: Cross multiply
   81,189,499.64x = 111,933,117.95 × 64,499,616.50
4. Step 4: Simplify right side
   81,189,499.64x = 7,219,643,180,542,102
5. Step 5: Solve for x
   x = 7,219,643,180,542,102/81,189,499.64
6. Step 6: Final answer
   x = 88,923,360.94