Finding the Fourth Proportional to 105,978,639.12, 146,229,081.84 and 61,917,128.28

Step by Step Solution

1. Step 1: Write the proportion equation
   105,978,639.12 : 146,229,081.84 = 61,917,128.28 : x
2. Step 2: Convert to fraction form
   105,978,639.12/146,229,081.84 = 61,917,128.28/x
3. Step 3: Cross multiply
   105,978,639.12x = 146,229,081.84 × 61,917,128.28
4. Step 4: Simplify right side
   105,978,639.12x = 9,054,084,818,553,898
5. Step 5: Solve for x
   x = 9,054,084,818,553,898/105,978,639.12
6. Step 6: Final answer
   x = 85,433,110.80