Finding the Fourth Proportional to 69,428, 95,856.72 and 42,978.08

Step by Step Solution

1. Step 1: Write the proportion equation
   69,428 : 95,856.72 = 42,978.08 : x
2. Step 2: Convert to fraction form
   69,428/95,856.72 = 42,978.08/x
3. Step 3: Cross multiply
   69,428x = 95,856.72 × 42,978.08
4. Step 4: Simplify right side
   69,428x = 4,119,737,780.70
5. Step 5: Solve for x
   x = 4,119,737,780.70/69,428
6. Step 6: Final answer
   x = 59,338.28