Finding the Fourth Proportional to 105,571,897.56, 145,637,447.16 and 91,613,661.60

Step by Step Solution

1. Step 1: Write the proportion equation
   105,571,897.56 : 145,637,447.16 = 91,613,661.60 : x
2. Step 2: Convert to fraction form
   105,571,897.56/145,637,447.16 = 91,613,661.60/x
3. Step 3: Cross multiply
   105,571,897.56x = 145,637,447.16 × 91,613,661.60
4. Step 4: Simplify right side
   105,571,897.56x = 13,342,379,800,404,120
5. Step 5: Solve for x
   x = 13,342,379,800,404,120/105,571,897.56
6. Step 6: Final answer
   x = 126,381,926.52