Finding the Fourth Proportional to 118,693, 163,796.70 and 64,978.48

Step by Step Solution

1. Step 1: Write the proportion equation
   118,693 : 163,796.70 = 64,978.48 : x
2. Step 2: Convert to fraction form
   118,693/163,796.70 = 64,978.48/x
3. Step 3: Cross multiply
   118,693x = 163,796.70 × 64,978.48
4. Step 4: Simplify right side
   118,693x = 10,643,260,595.02
5. Step 5: Solve for x
   x = 10,643,260,595.02/118,693
6. Step 6: Final answer
   x = 89,670.50