Finding the Fourth Proportional to 76,603.51, 105,719.22 and 42,618.40

Step by Step Solution

1. Step 1: Write the proportion equation
   76,603.51 : 105,719.22 = 42,618.40 : x
2. Step 2: Convert to fraction form
   76,603.51/105,719.22 = 42,618.40/x
3. Step 3: Cross multiply
   76,603.51x = 105,719.22 × 42,618.40
4. Step 4: Simplify right side
   76,603.51x = 4,505,584,005.65
5. Step 5: Solve for x
   x = 4,505,584,005.65/76,603.51
6. Step 6: Final answer
   x = 58,816.94