Finding the Fourth Proportional to 120,970.40, 181,528.56 and 42,139.98

Step by Step Solution

1. Step 1: Write the proportion equation
   120,970.40 : 181,528.56 = 42,139.98 : x
2. Step 2: Convert to fraction form
   120,970.40/181,528.56 = 42,139.98/x
3. Step 3: Cross multiply
   120,970.40x = 181,528.56 × 42,139.98
4. Step 4: Simplify right side
   120,970.40x = 7,649,609,887.83
5. Step 5: Solve for x
   x = 7,649,609,887.83/120,970.40
6. Step 6: Final answer
   x = 63,235.39