Finding the Fourth Proportional to 42,399,740.79, 63,586,128.33 and 13,639,181.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,399,740.79 : 63,586,128.33 = 13,639,181.76 : x
2. Step 2: Convert to fraction form
   42,399,740.79/63,586,128.33 = 13,639,181.76/x
3. Step 3: Cross multiply
   42,399,740.79x = 63,586,128.33 × 13,639,181.76
4. Step 4: Simplify right side
   42,399,740.79x = 867,262,761,707,555.25
5. Step 5: Solve for x
   x = 867,262,761,707,555.25/42,399,740.79
6. Step 6: Final answer
   x = 20,454,435.46