Finding the Fourth Proportional to 105,985.56, 158,632.20 and 77,898.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105,985.56 : 158,632.20 = 77,898.18 : x
2. Step 2: Convert to fraction form
   105,985.56/158,632.20 = 77,898.18/x
3. Step 3: Cross multiply
   105,985.56x = 158,632.20 × 77,898.18
4. Step 4: Simplify right side
   105,985.56x = 12,357,159,669.40
5. Step 5: Solve for x
   x = 12,357,159,669.40/105,985.56
6. Step 6: Final answer
   x = 116,592.86