Finding the Fourth Proportional to 113,164.06, 169,719.75 and 42,120.15

Step by Step Solution

1. Step 1: Write the proportion equation
   113,164.06 : 169,719.75 = 42,120.15 : x
2. Step 2: Convert to fraction form
   113,164.06/169,719.75 = 42,120.15/x
3. Step 3: Cross multiply
   113,164.06x = 169,719.75 × 42,120.15
4. Step 4: Simplify right side
   113,164.06x = 7,148,621,672.51
5. Step 5: Solve for x
   x = 7,148,621,672.51/113,164.06
6. Step 6: Final answer
   x = 63,170.43