Finding the Fourth Proportional to 78,101.28, 107,779.62 and 42,291.40

Step by Step Solution

1. Step 1: Write the proportion equation
   78,101.28 : 107,779.62 = 42,291.40 : x
2. Step 2: Convert to fraction form
   78,101.28/107,779.62 = 42,291.40/x
3. Step 3: Cross multiply
   78,101.28x = 107,779.62 × 42,291.40
4. Step 4: Simplify right side
   78,101.28x = 4,558,151,021.27
5. Step 5: Solve for x
   x = 4,558,151,021.27/78,101.28
6. Step 6: Final answer
   x = 58,362.05