Finding the Fourth Proportional to 42,065.60, 58,054.62 and 31,436.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,065.60 : 58,054.62 = 31,436.78 : x
2. Step 2: Convert to fraction form
   42,065.60/58,054.62 = 31,436.78/x
3. Step 3: Cross multiply
   42,065.60x = 58,054.62 × 31,436.78
4. Step 4: Simplify right side
   42,065.60x = 1,825,050,316.92
5. Step 5: Solve for x
   x = 1,825,050,316.92/42,065.60
6. Step 6: Final answer
   x = 43,385.81