Finding the Fourth Proportional to 76,474, 105,538.80 and 42,940

Step by Step Solution

1. Step 1: Write the proportion equation
   76,474 : 105,538.80 = 42,940 : x
2. Step 2: Convert to fraction form
   76,474/105,538.80 = 42,940/x
3. Step 3: Cross multiply
   76,474x = 105,538.80 × 42,940
4. Step 4: Simplify right side
   76,474x = 4,531,836,072
5. Step 5: Solve for x
   x = 4,531,836,072/76,474
6. Step 6: Final answer
   x = 59,259.83