Finding the Fourth Proportional to 70,980.28, 97,980.78 and 42,680.50

Step by Step Solution

1. Step 1: Write the proportion equation
   70,980.28 : 97,980.78 = 42,680.50 : x
2. Step 2: Convert to fraction form
   70,980.28/97,980.78 = 42,680.50/x
3. Step 3: Cross multiply
   70,980.28x = 97,980.78 × 42,680.50
4. Step 4: Simplify right side
   70,980.28x = 4,181,868,680.79
5. Step 5: Solve for x
   x = 4,181,868,680.79/70,980.28
6. Step 6: Final answer
   x = 58,915.92