Finding the Fourth Proportional to 77,978.34, 107,610.12 and 42,168.36

Step by Step Solution

1. Step 1: Write the proportion equation
   77,978.34 : 107,610.12 = 42,168.36 : x
2. Step 2: Convert to fraction form
   77,978.34/107,610.12 = 42,168.36/x
3. Step 3: Cross multiply
   77,978.34x = 107,610.12 × 42,168.36
4. Step 4: Simplify right side
   77,978.34x = 4,537,742,279.80
5. Step 5: Solve for x
   x = 4,537,742,279.80/77,978.34
6. Step 6: Final answer
   x = 58,192.34