Finding the Fourth Proportional to 137,339,456.58, 189,481,575.39 and 85,109,435.10

Step by Step Solution

1. Step 1: Write the proportion equation
   137,339,456.58 : 189,481,575.39 = 85,109,435.10 : x
2. Step 2: Convert to fraction form
   137,339,456.58/189,481,575.39 = 85,109,435.10/x
3. Step 3: Cross multiply
   137,339,456.58x = 189,481,575.39 × 85,109,435.10
4. Step 4: Simplify right side
   137,339,456.58x = 16,126,669,843,300,960
5. Step 5: Solve for x
   x = 16,126,669,843,300,960/137,339,456.58
6. Step 6: Final answer
   x = 117,421,972.13