Finding the Fourth Proportional to 105,128,940.39, 145,076,409.50 and 58,719,854.31

Step by Step Solution

1. Step 1: Write the proportion equation
   105,128,940.39 : 145,076,409.50 = 58,719,854.31 : x
2. Step 2: Convert to fraction form
   105,128,940.39/145,076,409.50 = 58,719,854.31/x
3. Step 3: Cross multiply
   105,128,940.39x = 145,076,409.50 × 58,719,854.31
4. Step 4: Simplify right side
   105,128,940.39x = 8,518,865,629,364,301
5. Step 5: Solve for x
   x = 8,518,865,629,364,301/105,128,940.39
6. Step 6: Final answer
   x = 81,032,545.35