Finding the Fourth Proportional to 99,705,196.47, 137,666,054.07 and 64,443,864.38

Step by Step Solution

1. Step 1: Write the proportion equation
   99,705,196.47 : 137,666,054.07 = 64,443,864.38 : x
2. Step 2: Convert to fraction form
   99,705,196.47/137,666,054.07 = 64,443,864.38/x
3. Step 3: Cross multiply
   99,705,196.47x = 137,666,054.07 × 64,443,864.38
4. Step 4: Simplify right side
   99,705,196.47x = 8,871,732,518,560,992
5. Step 5: Solve for x
   x = 8,871,732,518,560,992/99,705,196.47
6. Step 6: Final answer
   x = 88,979,640.31