Finding the Fourth Proportional to 105,256,287.86, 145,298,402.12 and 65,583,419.82

Step by Step Solution

1. Step 1: Write the proportion equation
   105,256,287.86 : 145,298,402.12 = 65,583,419.82 : x
2. Step 2: Convert to fraction form
   105,256,287.86/145,298,402.12 = 65,583,419.82/x
3. Step 3: Cross multiply
   105,256,287.86x = 145,298,402.12 × 65,583,419.82
4. Step 4: Simplify right side
   105,256,287.86x = 9,529,166,105,411,138
5. Step 5: Solve for x
   x = 9,529,166,105,411,138/105,256,287.86
6. Step 6: Final answer
   x = 90,532,986.67