Finding the Fourth Proportional to 78,801.91, 108,742.84 and 42,989.79

Step by Step Solution

1. Step 1: Write the proportion equation
   78,801.91 : 108,742.84 = 42,989.79 : x
2. Step 2: Convert to fraction form
   78,801.91/108,742.84 = 42,989.79/x
3. Step 3: Cross multiply
   78,801.91x = 108,742.84 × 42,989.79
4. Step 4: Simplify right side
   78,801.91x = 4,674,831,855.60
5. Step 5: Solve for x
   x = 4,674,831,855.60/78,801.91
6. Step 6: Final answer
   x = 59,323.84