Finding the Fourth Proportional to 42,990.16, 64,191 and 38,518.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,990.16 : 64,191 = 38,518.96 : x
2. Step 2: Convert to fraction form
   42,990.16/64,191 = 38,518.96/x
3. Step 3: Cross multiply
   42,990.16x = 64,191 × 38,518.96
4. Step 4: Simplify right side
   42,990.16x = 2,472,570,561.36
5. Step 5: Solve for x
   x = 2,472,570,561.36/42,990.16
6. Step 6: Final answer
   x = 57,514.80