Finding the Fourth Proportional to 105,435,477.42, 145,518,368.67 and 72,368,561.58

Step by Step Solution

1. Step 1: Write the proportion equation
   105,435,477.42 : 145,518,368.67 = 72,368,561.58 : x
2. Step 2: Convert to fraction form
   105,435,477.42/145,518,368.67 = 72,368,561.58/x
3. Step 3: Cross multiply
   105,435,477.42x = 145,518,368.67 × 72,368,561.58
4. Step 4: Simplify right side
   105,435,477.42x = 10,530,955,024,116,036
5. Step 5: Solve for x
   x = 10,530,955,024,116,036/105,435,477.42
6. Step 6: Final answer
   x = 99,880,564.70