Finding the Fourth Proportional to 105,719.60, 145,751.91 and 83,987.98

Step by Step Solution

1. Step 1: Write the proportion equation
   105,719.60 : 145,751.91 = 83,987.98 : x
2. Step 2: Convert to fraction form
   105,719.60/145,751.91 = 83,987.98/x
3. Step 3: Cross multiply
   105,719.60x = 145,751.91 × 83,987.98
4. Step 4: Simplify right side
   105,719.60x = 12,241,407,617.74
5. Step 5: Solve for x
   x = 12,241,407,617.74/105,719.60
6. Step 6: Final answer
   x = 115,791.28