Finding the Fourth Proportional to 105,978.23, 146,213.80 and 65,677.29

Step by Step Solution

1. Step 1: Write the proportion equation
   105,978.23 : 146,213.80 = 65,677.29 : x
2. Step 2: Convert to fraction form
   105,978.23/146,213.80 = 65,677.29/x
3. Step 3: Cross multiply
   105,978.23x = 146,213.80 × 65,677.29
4. Step 4: Simplify right side
   105,978.23x = 9,602,925,432.11
5. Step 5: Solve for x
   x = 9,602,925,432.11/105,978.23
6. Step 6: Final answer
   x = 90,612.25