Finding the Fourth Proportional to 78,800.72, 108,742.83 and 42,990.71

Step by Step Solution

1. Step 1: Write the proportion equation
   78,800.72 : 108,742.83 = 42,990.71 : x
2. Step 2: Convert to fraction form
   78,800.72/108,742.83 = 42,990.71/x
3. Step 3: Cross multiply
   78,800.72x = 108,742.83 × 42,990.71
4. Step 4: Simplify right side
   78,800.72x = 4,674,930,925.40
5. Step 5: Solve for x
   x = 4,674,930,925.40/78,800.72
6. Step 6: Final answer
   x = 59,326.00