Finding the Fourth Proportional to 91,898,109.45, 128,980,203.64 and 91,898,109.45

Step by Step Solution

1. Step 1: Write the proportion equation
   91,898,109.45 : 128,980,203.64 = 91,898,109.45 : x
2. Step 2: Convert to fraction form
   91,898,109.45/128,980,203.64 = 91,898,109.45/x
3. Step 3: Cross multiply
   91,898,109.45x = 128,980,203.64 × 91,898,109.45
4. Step 4: Simplify right side
   91,898,109.45x = 11,853,036,870,762,264
5. Step 5: Solve for x
   x = 11,853,036,870,762,264/91,898,109.45
6. Step 6: Final answer
   x = 128,980,203.64