Finding the Fourth Proportional to 83,820.42, 115,639.38 and 47,991.42

Step by Step Solution

1. Step 1: Write the proportion equation
   83,820.42 : 115,639.38 = 47,991.42 : x
2. Step 2: Convert to fraction form
   83,820.42/115,639.38 = 47,991.42/x
3. Step 3: Cross multiply
   83,820.42x = 115,639.38 × 47,991.42
4. Step 4: Simplify right side
   83,820.42x = 5,549,698,054.12
5. Step 5: Solve for x
   x = 5,549,698,054.12/83,820.42
6. Step 6: Final answer
   x = 66,209.38