Finding the Fourth Proportional to 153,798.72, 230,736.96 and 42,990.72

Step by Step Solution

1. Step 1: Write the proportion equation
   153,798.72 : 230,736.96 = 42,990.72 : x
2. Step 2: Convert to fraction form
   153,798.72/230,736.96 = 42,990.72/x
3. Step 3: Cross multiply
   153,798.72x = 230,736.96 × 42,990.72
4. Step 4: Simplify right side
   153,798.72x = 9,919,548,041.01
5. Step 5: Solve for x
   x = 9,919,548,041.01/153,798.72
6. Step 6: Final answer
   x = 64,496.95