Finding the Fourth Proportional to 72,509,911.61, 99,873,064.20 and 55,732,567.67

Step by Step Solution

1. Step 1: Write the proportion equation
   72,509,911.61 : 99,873,064.20 = 55,732,567.67 : x
2. Step 2: Convert to fraction form
   72,509,911.61/99,873,064.20 = 55,732,567.67/x
3. Step 3: Cross multiply
   72,509,911.61x = 99,873,064.20 × 55,732,567.67
4. Step 4: Simplify right side
   72,509,911.61x = 5,566,182,308,437,389
5. Step 5: Solve for x
   x = 5,566,182,308,437,389/72,509,911.61
6. Step 6: Final answer
   x = 76,764,433.79