Finding the Fourth Proportional to 81,768,978.72, 122,708,012.31 and 42,413,503.65

Step by Step Solution

1. Step 1: Write the proportion equation
   81,768,978.72 : 122,708,012.31 = 42,413,503.65 : x
2. Step 2: Convert to fraction form
   81,768,978.72/122,708,012.31 = 42,413,503.65/x
3. Step 3: Cross multiply
   81,768,978.72x = 122,708,012.31 × 42,413,503.65
4. Step 4: Simplify right side
   81,768,978.72x = 5,204,476,727,994,430
5. Step 5: Solve for x
   x = 5,204,476,727,994,430/81,768,978.72
6. Step 6: Final answer
   x = 63,648,547.52