Finding the Fourth Proportional to 89,692.41, 134,472.73 and 42,978.09

Step by Step Solution

1. Step 1: Write the proportion equation
   89,692.41 : 134,472.73 = 42,978.09 : x
2. Step 2: Convert to fraction form
   89,692.41/134,472.73 = 42,978.09/x
3. Step 3: Cross multiply
   89,692.41x = 134,472.73 × 42,978.09
4. Step 4: Simplify right side
   89,692.41x = 5,779,381,092.49
5. Step 5: Solve for x
   x = 5,779,381,092.49/89,692.41
6. Step 6: Final answer
   x = 64,435.56