Finding the Fourth Proportional to 118,704.20, 163,805.57 and 64,978.92

Step by Step Solution

1. Step 1: Write the proportion equation
   118,704.20 : 163,805.57 = 64,978.92 : x
2. Step 2: Convert to fraction form
   118,704.20/163,805.57 = 64,978.92/x
3. Step 3: Cross multiply
   118,704.20x = 163,805.57 × 64,978.92
4. Step 4: Simplify right side
   118,704.20x = 10,643,908,703.69
5. Step 5: Solve for x
   x = 10,643,908,703.69/118,704.20
6. Step 6: Final answer
   x = 89,667.50